259results about "Surface tension analysis" patented technology

The invention discloses a capillary pressure and contact angle synchronous characterization method and device of a microfluidic fluid interface, and relates to the field of interface analysis and multiphase seepage in pore media, and the method comprises the following steps: based on a pre-configured pore, particle and fluid binary image, distinguishing and extracting a fluid-particle contact interface contour and an attack / defense fluid interface contour; fitting and determining the curvature radius of each fluid interface contour through a watershed region division algorithm and reordering smoothing of Fourier descriptors; generating a multi-level size pore space based on the pore binary image, and obtaining a pore overlook radius; calculating a necking angle in combination with the curvature radius and the multi-stage size pore space to obtain an apparent contact angle and an intrinsic contact angle; and calculating the capillary pressure of the attack / defense fluid interface by combining the curvature radius, the pore overlook radius, the chip depth and the interfacial tension. According to the invention, high-precision technical support is provided for micro-fluidic multiphase seepage research.

The invention relates to the technical field of processing, testing or inspection of aircraft parts, and provides a method for detecting surface defects of an aluminum alloy plate with an epoxy coating. The method comprises the following steps: applying an epoxy coating doped with a zinc yellow pigment to an anodic oxide film to construct a coating test piece with a color difference indication function, and placing the coating test piece in a coastal atmospheric environment for exposure sampling. In the detection process, the gloss loss rate, the chromatic aberration, the contact angle, the defect area proportion and the corrosion current density are collected, a dynamic correction coefficient is calculated according to the hydrolysis degree of the zinc yellow pigment, all parameter thresholds are adjusted in a self-adaptive mode, and a threshold set is constructed. And in combination with scanning electron microscope image segmentation and Tafel extrapolation analysis, multi-source indexes are fused to judge whether the coating is invalid. According to the method, the hydrolysis behavior of the zinc yellow pigment can be tracked in real time, the judgment standards of optical, morphology and electrochemical indexes are automatically corrected, and the accuracy and reliability of failure detection of the epoxy coating aluminum alloy plate under the coastal service condition are improved.

The present disclosure relates to methods and apparatus for characterising an interaction between a stimulus and a liquid thin film. An aspect of the disclosure provides a spectroscopic ellipsometry apparatus for characterising an interaction between a stimulus and a liquid thin film, the apparatus comprising: a stimulator, configured to provide a stimulus to a liquid thin film disposed on a volume of liquid to generate a wave in the liquid thin film, the liquid thin film and the volume of liquid having an interface therebetween, light beam optics for illuminating an area of the liquid thin film with a light beam, the light beam having a first polarisation, and a light collector coupled to a detector for receiving the light beam after reflection by the liquid thin film, the light beam having a second polarisation after reflection by the liquid thin film; a wave measurement module coupled to the light collector and configured to provide surface wave data to characterise a Lucassen wave in the liquid thin film based on the second polarisation.

The invention discloses a method and a device for measuring a dynamic contact angle of liquid on a solid surface. The method comprises the following steps: constructing a to-be-measured system containing a first liquid phase, a fluid phase and a solid phase; immersing the to-be-detected surface of the solid phase in the environment phase upwards or downwards; an end surface object is arranged opposite to the to-be-detected surface, and the two are immersed in the same environment phase; the relative distance and position of the two are adjusted, and a longitudinal fluid bridge is formed through the liquid adding device; the camera device obtains a fluid bridge interface contour image from the side surface; horizontally moving the surface of the end surface object or the solid phase, and applying transverse lateral dragging acting force to the fluid bridge to promote the fluid bridge to deform and contact the peripheral line to move or be about to move; and recording the time sequence change of the image, analyzing and calculating to obtain the time change relationship between the contact angle value and the three-phase contact point position value, and further determining the static, forward and backward contact angles and the contact angle hysteresis value. The method is simple and accurate, has wide applicability, and can cover reliable dynamic contact angle data measurement from hydrophilic to super-hydrophobic surfaces.

The present invention discloses a bionic regulation method for a number of bounces of a droplet on a metal surface based on acoustic in-situ monitoring, which comprises the following steps: obtaining dynamic contact characteristics and acoustic properties of a solid-liquid interface of metal superhydrophobic surfaces with different surface information in the droplet bounce process based on an optical-acoustic synchronous in-situ testing system for droplet bounces; and obtaining a correlation among the metal superhydrophobic surface, the acoustic response and the droplet bounce behavior based on the dynamic contact characteristics and the acoustic properties of the solid-liquid interface, and machining and modifying a micro-nano structure of the metal surface by combining a coupled bionic concept according to the correlation. A scientific basis and a novel design method are provided for the bionic regulation of the number of droplet bounces over the metal surface.

The invention relates to an alkali metal gas chamber anti-relaxation self-assembly molecular coating adsorption energy quantification method, which finally realizes the physical quantification of the anti-relaxation coating adsorption energy by establishing a contact angle and surface topography collaborative characterization model and combining an adsorption-desorption dynamic formula, and is characterized by comprising the following steps: 1) establishing a contact angle and surface topography collaborative characterization model; depositing organosilane on a gas chamber glass substrate by adopting a liquid phase self-assembly method to form an anti-relaxation coating sample; step 2, selecting a plurality of measuring points on the anti-relaxation coating sample, dropping a 1 [mu] L ultrapure water liquid drop on each measuring point, determining a polarization retention angle of each measuring point according to the liquid drop height and the liquid drop substrate radius obtained by a contact angle measuring instrument, and scanning a local area of the corresponding measuring point by using an atomic force microscope (AFM), extracting an arithmetic mean value Ra of the surface roughness parameter and a root-mean-square value Rq of the surface roughness parameter as quantitative indexes of the polarization maintaining cross section; and step 3, taking free energy formed by the molecular layer of the coating as coating adsorption energy delta G.

The invention provides an experimental device for measuring a rock wetting contact angle and a measuring method thereof, and belongs to the technical field of rock physical property measurement, the experimental device comprises an ISCO constant-pressure constant-speed pump, a piston container, a control switch, a constant-temperature circulating system and an image processing system, the ISCO constant-pressure constant-speed pump is connected with the piston container through a first pipeline, and the piston container is connected with the control switch through a second pipeline; the ISCO constant-pressure and constant-speed pump is used for accurately injecting fluid at constant pressure and constant speed, the piston container is connected with the constant-temperature circulating system through a second pipeline and used for storing liquid, the constant-temperature circulating system is connected with a software interface of the ISCO constant-pressure and constant-speed pump and used for conducting experimental testing and adjusting temperature and pressure, and a control switch is arranged on the second pipeline. And the image processing system is connected with the constant-temperature circulating system and is used for calculating the wetting contact angle of the two-phase fluid in the shot image. The device provided by the invention realizes real-time dynamic monitoring of wettability under the conditions of different pore pressures, different pore diameters and various displacement media.

The invention discloses an experiment-numerical value-machine learning fusion-based in-oil liquid drop electric field dynamics modeling and regulation method, which comprises the following steps of: firstly, constructing a high-voltage electric field liquid drop experiment system, and testing oil liquid drop experiment data in oil; then establishing a multi-physics field coupling model, and describing deformation and flow field evolution of oil drops in oil under a strong electric field; and finally, constructing a BP neural network and optimizing an initial weight and a threshold value to realize rapid prediction of the deformation behavior of the oil drops in the oil under the action of the electric field. According to the method, an experimental characterization-numerical solution-machine learning optimization three-layer collaborative system is constructed, a whole-process closed loop from physical property determination, equation solution to algorithm prediction is realized, and droplet deformation, charge distribution and interface response are rapidly predicted under the conditions of different electric field intensities, temperatures and emulsifier concentrations; and active control of electric field behaviors can be realized through parameter reverse adjustment, and reliable modeling and optimization basis is provided for an electrowetting chip, a flexible EHD pump and a microfluidic liquid drop regulation and control system.

The invention relates to the technical field of model construction, in particular to a displacement fluid and shale rock imbibition law numerical simulation method and system. According to the method, by quantitatively analyzing the linear correlation degree of granularity and experimental capillary constant distribution and the disturbance degree of local feature points, regularization parameters of a regression algorithm are dynamically adjusted, and on the basis of accurately-calibrated capillary constants, a contact angle is determined by combining permeability characteristic data of probe liquid, so that the permeability of the probe liquid is determined. According to the method, shale surface free energy is obtained through surface energy component theoretical model decoupling, the interface action state of displacement fluid, shale and crude oil is reflected through a three-phase contact angle determined through a three-phase equilibrium relation, and the adhesion work needed by shale oil stripping is obtained. According to the method, the high-precision fitting model of the granularity and the capillary constant is established, and the surface energy component theory is combined, so that more accurate calculation of the shale oil stripping adhesion work is realized, and a reliable numerical simulation basis is provided for improving the shale oil recovery ratio.

This invention discloses a hydrophobicity rating system for superhydrophobic surfaces of energy equipment, relating to the field of hydrophobicity rating technology. The system includes a data acquisition module, an optimal parameter combination module, a sample preparation module, a hydrophobicity quantification and evaluation module, a test closed-loop calibration module, and a hydrophobicity rating classification and output module. These modules are interconnected, and through their collaborative operation, the system quantifies, performs closed-loop calibration, and classifies the hydrophobicity index of superhydrophobic samples of energy equipment with different microstructures. The closed-loop calibration process fully considers both anti-icing and weather resistance, significantly improving the accuracy and generalization ability of the hydrophobicity rating results. This solves the problems of inaccurate evaluation results and inability to adapt to extreme field conditions caused by traditional evaluation systems relying solely on conventional laboratory environments, single physical tests, and empirical thresholds for rating. This enhances the intelligence level of hydrophobicity rating evaluation for superhydrophobic surfaces of energy equipment.

The present invention relates to a rheo-optical method for the mechanical characterization of cellular spheroids and biopsies of biological tissues through: • The use of samples without special preparations; • The execution of compression tests with a load (weight) within standard plates for cell cultures; • The possibility of applying the load (weight) using inexpensive and easily obtainable equipment; • The possibility of conducting the tests in a sterile environment; • The acquisition of images of the sample and their analysis for calculating the elastic and viscous modulus.

The utility model discloses a paper and water contact angle test sample pretreatment table device which comprises a working table, a sample table arranged at the top of the working table, mucilage glue arranged on the side wall of the sample table in a surrounding mode, a tension sensor used for monitoring tension changes of paper in real time arranged in the sample table, and a plurality of inclined track grooves formed in the periphery of the sample table. A linear motion sliding table is installed in the inclined rail groove, a telescopic rod is installed on a sliding plate of the linear motion sliding table, the output end of the telescopic rod is vertically upward and provided with a clamp used for clamping paper, an annular cutter is further arranged above the sample table, and the inner diameter of the annular cutter is smaller than the outer diameter of the sample table. The two ends of the annular cutter are connected with a lifting air cylinder arranged on the workbench. A bubble level for leveling the workbench is also arranged on one side of the sample table; by means of the design, the technical problems that in a traditional treatment mode, complex pretreatment, such as flat layer coating or special paper adopting, usually needs to be conducted on paper, the operation difficulty is high, and a test result deviates from a true value are solved.

The utility model discloses an experimental device for evaluating the influence of oil well production pressure difference on the stability of oil-water emulsion, which is characterized in that an outlet of a produced water temperature-resistant and pressure-resistant container is connected with an inlet of a trace water injection pump, and an outlet of a produced oil temperature-resistant and pressure-resistant container is connected with an inlet of a trace oil injection pump; outlets of the micro water injection pump and the micro oil injection pump are respectively connected with two inlets of the three-way valve, an outlet of the three-way valve is connected with a liquid phase inlet of the high-pressure emulsification tank, and a liquid outlet of the high-pressure emulsification tank is connected with an inlet of the storage type temperature-resistant and pressure-resistant container; an outlet of the storage type temperature-resistant and pressure-resistant container is connected with an oil pipe inlet of the small-sized double-wing well head device through a one-way pressure regulating valve, an oil nozzle sleeve outlet of the small-sized double-wing well head device is connected with a short pipe, and an outlet of the short pipe is inserted into a center hole of a large-end end cover of the transparent receiving cover. The side wall of the transparent receiving cover is provided with a transparent observation window and a high-speed camera. The device can simulate various working conditions in actual production, provides an emulsion stability evaluation report, and is beneficial to optimization of an oil field production process.

The invention discloses an optimal selection method of a surfactant for an oil reservoir, and belongs to the technical field of oil development. The optimal selection method comprises the following steps: preparing N pretreated parallel plunger samples, displacing a simulated oil layer with crude oil, aging the plunger samples under a formation condition until the plunger samples reach the wettability of an oil reservoir, and sampling and measuring an initial contact angle; performing oil displacement on the N aged plunger samples by using N surfactants to obtain corresponding oil displacement efficiency, and sampling and measuring a contact angle; comprehensive indexes are calculated based on the oil displacement efficiency, the contact angle and the initial contact angle, and the surfactants are sorted according to the comprehensive indexes. According to the method, a parallel plunger sample is selected to carry out an oil displacement efficiency experiment by adopting different surfactants in a simulated oil layer state, the performance of the surfactant is evaluated based on the oil displacement efficiency experiment and indexes such as wettability and oil displacement efficiency obtained before and after oil displacement implementation, finally a comprehensive index is selected, and the surfactant is preferably selected based on the comprehensive index.

The invention discloses a compatibility evaluation method and device of a transformer structure material and an insulating liquid, electronic equipment and a storage medium, and belongs to the technical field of electrical insulation detection.The method comprises the steps that compatibility evaluation indexes of the transformer structure material and the insulating liquid are obtained; index characteristics corresponding to the compatibility evaluation indexes are calculated; wherein the index characteristics comprise trend intensity, fluctuation characteristics and mutation characteristics; according to the index characteristics, calculating a weight coefficient corresponding to each compatibility evaluation index, according to the index value of each compatibility evaluation index and the corresponding weight coefficient, calculating a compatibility comprehensive score of the transformer structure material and the insulating liquid, and then according to the compatibility comprehensive score, determining the compatibility of the transformer structure material and the insulating liquid. Therefore, by implementing the method, the problem that the compatibility of the transformer structure material and the insulating liquid cannot be evaluated in the prior art can be solved.

The invention provides application of droplet merging induced bounce and a solid surface energy measuring system and method, and belongs to the technical field of surface science and precision measurement. Firstly, the invention provides an application of a droplet combination induced bounce phenomenon in solid surface energy measurement. Secondly, the invention provides a measuring system which comprises a liquid drop distribution unit, a merging induction unit, a high-speed image acquisition unit and a data processing and analyzing unit. Finally, a measuring method is provided, two liquid drops with similar sizes are prepared on the surface of a solid, and the liquid drops are induced to be combined and bounce; relevant parameters are extracted, and a Young's equation contact angle of the smooth surface is obtained based on an energy conservation model and a Cassie-Baxter model; and the total surface energy of the super-hydrophobic solid is obtained by simultaneously solving dispersion and polar components of the surface of the super-hydrophobic solid by using data of at least two liquids. According to the method, the surface energy is measured by using liquid drops and bounce, and the defect of low-surface-energy material measurement by a traditional contact angle method is overcome.

A method for determining physical parameters of a liquid (22) to be aspirated and / or dispensed by a laboratory automation device (10) comprises: pickup of a pipette (14) with the laboratory automation device (10); lowering the pipette (14) into a sample container (18) with the laboratory automation device (10), the sample container (18) containing the liquid (22); aspirating and dispensing air and liquid (22) with the laboratory automation device (10) in such a way, that a liquid level in the pipette (14) solely rises in a first step and solely lowers in a second step, such that an interior surface of the pipette (14) is wetted with liquid solely one time; and during aspirating and dispensing air and liquid (22), measuring a pressure curve (40) in the pipette (14) and determining the physical parameters from the pressure curve (40), the physical parameters comprising at least one of a surface tension, a wetting angle and a viscosity.

The invention discloses a teaching solid-liquid contact angle software and hardware measurement system based on a seating drop method, and the system comprises a hardware device and a software interaction and algorithm, the device can achieve the manual rotation of an XY plane and a YZ plane and the manual translation of an X axis and a Z axis, and the software interaction and algorithm comprises the steps: S1, enabling a plane where a camera is located to be perpendicular to a plane where a liquid drop is located, and carrying out the photographing to obtain a liquid drop picture; s2, carrying out graying processing on the liquid drop picture; s3, performing multi-stage interactive cutting on the grayed picture; s4, a Canny edge detection algorithm or a thresholding method is adopted, the contour extraction of the cut picture is completed through shading, iterative optimization is carried out, and liquid drop contour data are output; s5, drawing a liquid drop contour line on the grayscale image, drawing a base line, and calculating to obtain contact angle data; software provided by the invention is point-and-play, and the software can be matched and cooperated with designed hardware to complete a contact angle data acquisition function, and can also be independently used to process a liquid drop picture to obtain a contact angle numerical value.

This invention relates to a method for calculating the restoring force caused by the surface tension of liquid fuel in a storage tank: A ground-based scaled-down storage tank control group is constructed, comprising three sets of scaled-down storage tanks, with each set consisting of two tanks filled with different test solutions; a ground swaying test is conducted on the ground-based scaled-down storage tank control group, and the first-order swaying fundamental frequency is recorded; the first-order resonance process of each ground-based scaled-down storage tank in the ground swaying test is equivalent to that of a simple pendulum model; and the gravitational acceleration g between the control groups formed by the same scaled-down storage tank radius and different test solutions is calculated. mn Based on the proportional relationship between the internal liquid surface tension and the equivalent acceleration generated by the internal liquid surface tension, the equivalent acceleration generated by the internal liquid surface tension of the scaled-down tanks in various locations is calculated. According to the principle that the liquid-filled tank of the spacecraft is proportional to the Bond number of the on-orbit environment, the equivalent acceleration generated by the internal liquid surface tension under the actual on-orbit operating conditions is extrapolated, and then converted into the restoring force caused by the surface tension of the liquid fuel inside the tank.

The invention discloses a resin-glass fiber coupling flow simulation test method which comprises the following steps: acquiring rheological characteristic parameters of resin and physical characteristic parameters of glass fiber, and measuring interface characteristic parameters; defining a plurality of glass fibers as equivalent fiber bundle flow units, and calculating physical characteristic parameters of the equivalent fiber bundle flow units; constructing a resin flow field model, and performing multi-scale simulation on the movement of the equivalent fiber bundle flow unit; constructing a motion equation of the equivalent fiber bundle flow unit, and outputting a motion velocity vector; and constructing a control equation of the resin flow field, outputting the distribution density of local equivalent fiber bundle flow units at different positions in the coupling flow process of the equivalent fiber bundle flow units and the resin flow field model, and further simulating the distribution density condition of the glass fibers when the glass fibers and the resin are mixed and flow under different conditions. The effect of mixed flowing of glass fibers and resin in different shapes is simulated, and effective guidance is provided for optimization of a composite material forming process.

The provided method includes: determining an energy parameter and a co-volume parameter of a pure gas by a PR state equation, and determining a material parameter and a co-volume parameter of a mixed gas by a Waals one-fluid mixing rule and a combination rule; determining a Helmholtz free energy density and an equilibrium density of the pure gas by a Wertheim molecular association theory, and determining Helmholtz free energy and an equilibrium density of a (H2+N2) mixed gas with different components by a density mixing rule; determining an influence parameter of the pure gas by a gradient theory (GT), and determining an influence parameter of the mixed gas by the influence parameter of the pure gas and an interaction coefficient; simplifying a GT model; and obtaining the surface tension of the (H2+N2) / H2O system at different temperatures by combining the LGT model and the PR state equation.

This invention discloses a device for measuring the surface tension coefficient of liquids based on surface waves. The invention includes a light box, an imaging box, a vibration table, and a signal generator. The light box has a light-emitting hole at the top, housing a built-in light-emitting diode (LED), and a plano-convex lens is arranged in the optical path. The imaging box is a height-adjustable enclosure with an open bottom and a diffuser on the top. The vibration table includes two identical resonant horns positioned on opposite sides of the light-emitting hole, and a light-transmitting plate mounted on the two horns; a light-transmitting water tank is movably mounted on the light-transmitting plate. The two resonant horns are connected to the signal generator via a power amplifier and vibrate at the same frequency. The LED is connected to the signal generator via a strobe light controller and flashes pulses at the same frequency. The diffuser produces bright and dark fringes, and the surface tension coefficient of the liquid under test is obtained by measuring the distance between two bright fringes. This invention achieves high measurement accuracy with a simple device, and has advantages such as safety and reliability, making it suitable for experimental teaching in higher education institutions.

The invention discloses a method and system for monitoring a bubble contact angle in real time in a bubble impingement model, and belongs to the field of contact angle measurement. The problem that an existing contact angle monitoring method is not accurate is solved. According to the technical scheme, the method comprises the following steps: inversely fixing the surface of a to-be-tested sample in an experimental tank with a preset exposure area, and reserving a preset distance between the wall surface of the to-be-tested sample and a bubble generation channel at the bottom of the experimental tank so as to meet the space requirements of bubble generation and collision; the output end of the bubble generation channel outputs a single independent bubble, and a camera is started to record the collision dynamic process of the bubble and the wall surface of the to-be-detected sample; selecting a dynamic endpoint on the surface of the bubble in an image shot by a camera, calculating a dynamic angle in real time through a three-point method, and establishing a correlation model of the dynamic angle and a contact angle; the method is applied to the bubble collision model.

This invention discloses a method for predicting the dispersibility of titanium dioxide in plastics, comprising the following steps: Step 1: After drying, titanium dioxide is loaded into a gas chromatography column using a suction method; Step 2: The surface free energy of titanium dioxide is tested using reverse gas chromatography; Step 3: The resin is processed into a plastic plate; Step 4: The surface free energy of the plastic plate is tested using a seated drop method; Step 5: The interfacial tension and adhesion work are calculated using the surface free energy of titanium dioxide and the surface free energy of the plastic plate; Step 6: The dispersibility of titanium dioxide in plastics is evaluated based on the interfacial tension and adhesion work. The method of this invention evaluates the surface properties of titanium dioxide based on the detection of its surface free energy, which is beneficial for assessing the dispersibility of titanium dioxide in different dispersion systems. This method for predicting the dispersibility of titanium dioxide in plastics can improve the efficiency of titanium dioxide dispersibility testing in plastics, reduce labor intensity, and lower labor costs.

The invention belongs to the technical field of material surface performance detection, and particularly relates to a method for detecting biological pollution resistance and durability of a silicone rubber surface, and the method comprises the following steps: S1, sequentially carrying out biological membrane inhibition rate quantitative detection, antibacterial adhesion detection, protein adsorption resistance test and surface wettability test on a silicone rubber sample to be detected; s2, carrying out durability treatment on the parallel sample; s3, repeating partial or all tests in the step S1 on the sample treated in the step S2; s4, comparing the performance data obtained in the step S1 and the performance data obtained in the step S3, and evaluating the biological pollution resistance and durability of the silicone rubber sample. According to the invention, biological membrane inhibition rate quantitative detection, anti-bacterial adhesion detection, anti-protein adsorption performance test, surface wettability analysis and durability test are organically combined to form a complete evaluation closed loop from molecular adsorption to microbial community and from immediate efficiency to long-acting stability, and all key links of biological pollution are comprehensively covered.

To provide a method and a device for estimating floating droplet surface tension, which enable accurate estimation of surface tension of a floating droplet using the flotation technique even when the floating droplet is not truly spherical due to an external force required for flotation.SOLUTION: A floating droplet surface tension estimation method for estimating surface tension of a floating droplet is provided, the method involving correcting surface tension derived on the basis of a vibration frequency of the floating droplet using a correction equation including variables based on an external force applied to the floating droplet.SELECTED DRAWING: Figure 1

The invention provides a method for rapidly predicting the surface tension of a foam extinguishing agent on site, which comprises the following steps: S1, collecting the surface tension of different types of foam extinguishing agents under different temperature conditions; s2, taking the first surface tension and the temperature measured by the thermocouple as input data, and taking the second surface tension as output data; s3, establishing a machine learning model; s4, after the model parameters are initialized, establishing a mapping relation between the input data and the output data; s5, the first surface tension and the temperature are collected again to serve as input data, and the machine learning model is adopted to predict data of the second surface tension. According to the method, the maximum bubble pressure method is improved based on high-speed camera shooting and image recognition, temperature compensation and a machine learning model are combined to predict the surface tension of the foam extinguishing agent on the fire extinguishing and rescue site, and the requirements that on-site surface tension measurement operation is convenient, the device structure is simple, and the surface tension measurement result is high in accuracy can be met.

This invention discloses a testing fixture for the water contact angle of hollow fiber membranes, including a support assembly, a carrier assembly, an adhesive assembly, a display assembly, and a lifting assembly. The support assembly is symmetrically arranged on both sides, and each of the two sets of support assemblies has a carrier assembly for placing the component on its surface. The carrier assembly has an adhesive assembly for positioning the material on its surface. This invention solves the problem of the lack of an effective method to evaluate the hydrophilicity and hydrophobicity of the inner surface of hollow fiber dialysis membranes by coordinating the components, carrier assembly, adhesive assembly, display assembly, lifting assembly, and stopwatch. The testing method is simple and effective, requiring no special tools or equipment. This testing method and fixture can meet the requirements for rapid evaluation of the contact angle of the inner surface of hollow fiber membranes at the micron level. The testing method is simple, the testing cost is low, and the test results have high reliability. Therefore, it can be used as an evaluation tool for the hydrophilicity and hydrophobicity of the inner surface of hollow fiber membranes.

This invention relates to the technical fields of aircraft component processing, testing, and inspection, and provides a method for detecting surface defects in epoxy-coated aluminum alloy plates. The method involves applying an epoxy coating containing zinc yellow pigment onto an anodic oxide film to construct a coated test piece with color difference indication function, which is then exposed to a coastal atmospheric environment for sampling. During the detection process, data such as gloss loss rate, color difference, contact angle, defect area ratio, and corrosion current density are collected. A dynamic correction coefficient is calculated based on the degree of zinc yellow pigment hydrolysis, adaptively adjusting the threshold values ​​of each parameter and constructing a threshold set. Combining scanning electron microscopy image segmentation and Tafel extrapolation analysis, multi-source indicators are integrated to determine whether the coating has failed. This method can track the hydrolysis behavior of zinc yellow pigment in real time, automatically correct the judgment criteria for optical, morphological, and electrochemical indicators, and improve the accuracy and reliability of failure detection of epoxy-coated aluminum alloy plates under coastal service conditions.

The present application belongs to the technical field of aerosol measurement, and particularly relates to a method and system for measuring the surface tension of cloud droplets in the process of aerosol activation into clouds. The method comprises: building a system for measuring the surface tension of cloud droplets, including a cloud condensation nucleus counter, electrode plates, a high-voltage power supply, a condensation nucleus particle counter, and a differential mobility analyzer; applying a high-voltage electric field to cause positive and negative ions in the droplets to split under the traction of the electric field; aerosol samples are converted into droplets by absorbing water vapor in a cloud chamber, and the droplets split under the traction of the high-voltage electric field; the number concentration of the droplets in the outflow sample is measured by the condensation nucleus particle counter; the critical voltage at which the droplets split is obtained by fitting the graph of the number concentration of the droplets versus the voltage intensity; and the surface tension of the droplets is calculated according to the quantitative relationship between the critical voltage and the surface tension of the droplets. The present application can be used in atmospheric chemical transport simulation and climate models to evaluate the influence of the surface tension of cloud droplets on the number concentration and particle size of the cloud droplets.